1     the night of July 28, 1976, one of the greatest earthquakes in the twentieth century hit Tangshan, Hebei. Strange things were happening, but people thought little of the       2     (warn). Then, at 3:42 a. m., the earth shook

Nearly a       3     (three) of China felt it. In less than one minute Tangshan was in ruins and more than 400,000 people were killed or injured. In the afternoon came another quake. Even more building     4     (fall) down. People began to wonder if the disaster would end.

Glass recycling has become such a big industry that the amount of glass     1     (recycle) is not meeting the demand for new glass to be produced. Some states in U. S. have attempted to resolve this situation in hopes of encouraging the     2     (produce) of glass over plastic by offering monetary incentives (奖励) for glass. For example, California has a special program     3     you can earn five cents for most glass bottles as well as plastic ones and aluminum cans less than 24 ounces. For items over 24 ounces, you can earn 10 cents each.

Have you ever been to London? Which famous sites did you visit? Or, if it is the first time that you    1     (be) there, which one will you check out? Some world famous     2     (culture) sites may already be on your list: Buckingham Palace, Big Ben and the London Tower. However, a tour of London would be incomplete     3       checking out the London art scene.

The Burmese snub-nosed monkey (仰鼻猴) is a     1     (critical)threatened species of colobine monkey. The young animals’ coloring differs markedly from that of the adults. The species first gained the attention of scientists     2     (research) the hoolock gibbon (白眉长臂猿) in Burma in early 2010. It wasn’t until 2012 that a camera was set up     3     (capture) the first images of the new species. The     4     (know) population of the snub-nosed monkey in Burma is about 260-330 individuals. They are currently threatened by the destruction of their forest habitats from logging (伐木作业) and development in the area.

In the past few years, the number of wild animals     1     (decrease). If nothing     2     (do), man will be punished by nature.     3     (lucky), people begin to take actions. Some nature reserves (保护区)     4     (build) now so that animals can live in peace. If everyone has the sense of protecting wildlife, it is certain that an atmosphere of wildlife protection will come into being.

Imprinting is a form of learning in     1     a very young animal fixes its attention on the first object it has visual, auditory, or tactile experience with and then follows that object. Over the last few months, panda caretakers in China     2     (dress) up like the animal to make back-to-nature training more authentic for the cubs. The keepers wear panda costumes when dealing with the animals to try to make the pandas feel at home and to limit their interactions     3     humans. They hope the dress-up will make the animals’ transition to the wild     4     (easy) in the long run.

A series of water-conserving and recycling designs have been put into place     1     (improve) water usage for snow making, human consumption and other purposes, according to the Beijing 2022 organizing committee.

Around 90% of the snow     2     (use) at the Alpine skiing venue for the Pyeongchang 2018 Winter Olympics was reported artificial, while artificial snow     3     (be) also a feature of Vancouver 2010 and Sochi 2014.

The trip to Mount Huangshan leaves me a deep impression. The scenes are so breathtaking. The rolling sea of clouds will remind you how tiny we humans are. The hot spring at the foot of the mountain will undoubtedly help you get     1     (refresh)! The amazing thing is that the colder the temperature gets, the     2     (hot) the spring!

What comes next is the endless series of steps. You can’t help wondering     3     hard it was then for the people to put all those rocks into place.

Forrest, a biologist, uses a metal clicker to count every penguin he sees. It’s not easy. He is part of a team     1     (work) on the Antarctic environment. The survey will help scientists better understand the Antarctic environment. Over the years, the number of penguins in Antarctic     2     (go) down. Scientists say climate change is making the ocean warmer. “Penguins give us an idea about what is going on in the ocean around us,” Forrest says. This year, robotics engineers fly a drone to help him record each colony’s     3     (locate) and size.

    1       (locate) in the center of Spain, the capital city Madrid is famous for its art galleries. The Prado Museum has one of the world’s     2     (big) collections of art works and paintings by Picaso     3     (exhibit) at the Reina Sofia Museum. Many people are attracted to Madrid for its exciting nightlife, but the city appeals to young people because it is home     4     the Real Madrid soccer team with many star players.